Coal gas stoning range



Nov. 3, 1942.

N.-H. CARGILE COAL GAS BURNING- RAN-GE Filed Nov. 22, 1940 aSheets-Sheet l Neil H aaryize.

Nov. 3, 1942.- N. H. CARGILE coAL GAS BURNINGRANGE Filed Nov. 22, 1940 3Sheets-Sheet 2 {Veil h. @aryiZe Nov. 3, 1942.

N. H. QARGILE COAL GAS BURNING RANGE 3 Sheets-Sheet 5 Filed Nov. 22,1940 Patented Nov. 3, 1942 T OFFIC 13 Claims.

My invention relates to the art of coal ranges or cooking stoves,exemplified by U. S. Patents #51224, November 28, 1865, #112,377, March7, #1871, 158,653, January 12, 1875, #179,776, July 1, 1876, and#377,876, February 14, 1888.

One of the objects of the present invention is to improve the ranges orcooking stoves of the prior art so as to produce a range, etc, in whichfuel consumption is reduced to a minimum and heating or cookingefficiency raised to a maximum.

Another object is to provide a range or cooking stove of suchconstruction that it will not only burn hard or soft coal with greatefiiciency but the range, etc., will also be of a compact constructionand of pleasing appearance so as to bar monize with modern kitchenpractice.

Again, it is an object to provide a range or cooking stove in which thecombustion is so complete that .the formation of heavy or black smokeand soot is practically eliminated, thereby permitting the use ofshallower flues about the oven chamber and thus providing for anincrease in the oven space, for a given over-all dimension, than ispossible to obtain with the structures of the prior art.

Another object of my invention is to provide a magazine feed burner withwhich the fire may be held for long periods of time, with which burnerand simple air controls the heat to the cooking top and to the oven iseasily and quickly regulated or controlled, and with which arrangementsit is possible and practical, at all times, to have a quick, hot fireavailable for cooking by stirring up the fuel in the magazine, shakingthe grate and opening the air control dampers, and from time to timeadding a small amount of fuel.

More specifically, the invention has for its objects: to provide acooking stove or range having, at one side of the oven chamber, a closedfuel magazine with a grate at its bottom and having gas ports in oneside wall a short distance above the grate level, through which portsthe gases from the ignited fuel bed pass into a gas-burning chamberwhich is located between the magazine and the adjacent wall of the ovenchamber; to provide auxiliary or secondary air for combus tion to enterthe gas-burning chamber at about the level of and on the side oppositethe gas ports to effect full combustion of the gases; to provide aslanting grate so designed and positioned with respect to gas ports thatthe air passing through the grate, and the gases and products ofcombustion from the fuel, cause a side-wise flow to take place acrossthe bottom portion of the magazine, by virtue of which there will be atendency to hold the actual burning lower in the magazine than would bethe case if there were a fiat grate through which the air enteredvertically and then had to turn through right angles to go out-the sideports or pass under a division plate; to provide for passing these gasesaround the oven before discharging same to a smoke box and chimney flue;to provide for the admission of a proper supply of overdraft air intothe magazine adjacent its top, sufiicient in quantity to preventformation in the fuel body of tars in sufiicient amount to clog the fueland to cause a downflow of the products of distillation; and to providetwo air admission means under control of two valves for governing theprimary, overdraft and secondary air supplies. v

Other objects will in part be obvious and in part be pointed outhereinafter.

To the attainment of the aforesaid objects and ends the invention stillfurther resides in the novel details of construction, combination andarrangement of parts, all of which will be first fully described in thefollowing detailed description, and then be particularly pointed out inthe appended claims, reference being had to the accompanying drawings,in which:

Fig. l is a perspective view of a range or cooking stove embodying myinvention.

Fig. 2 is a view similar to Fig. l with parts broken away, the oven andwarming chamber doors open and the fuel feed door open.

Fig. 3 is a vertical section of the line 3'3 of Fig. 4.

Fig. 4 is a cross-section taken substantially on the line 4-4 of Fig. 3,but showing a modified positioning of holes 32 with respect to ports 36.

Fig. 5 is a cross-section on the line 5 5 of Fig. 3.

In the drawings, in which like numerals of reference indicate like partsin all of the figures, it

will be seen that the outer wall of the range is composed preferably ofan outer shell I, and. an inner shell 2 separated by an air space 3; atop casting 4 fits on this wall and a bottom 1 is provided as best shownin Figs. 3 and 4.

Within the space bounded by the outer wall of the range and spaced fromthe sides of the same is an oven shell 5, the back wall of which isconstituted by a part of the outer wall of the range and the front ofwhich is closed by a drop door It].

Located to one side of the oven and spaced therefrom to leave a sideflue is a transversely disposed vertical partition 6 formed, preferably,of two metal plates with rock wool insulation between them. 7

Beneath the oven and spalced from the bottom of the oven shell 5 isanother plate 24 with rock wool insulation between it and the bottom 7,the space between shell 5 and plate 24 constituting a continuation ofthe flue about the oven. A partitition or baffie flue strip 25 extendspartway across from the back wall to prevent the products of combustionpassing directly to the bottom flue opening 2 6, see Figs. 3 and 5.

The top of the shell is spaced from the level of the top casting 4 toform the top flue of which the side flue is a continuation. A top flueopening 27 to smoke box 29 is provided adjacent the entrant end of theoven embracing flue (see Figs. 3 and 5), and this opening 21 may beclosed by a sliding damper 28 after the fire has been started as will beclearer later.

At the other side of the oven there is provided a space which containsthe. fuel magazine and the combustion chamber for the gases. Access tothis space may be had through a front door 9. In this space is atransverse vertical partition 3i that extends up from bottom l to aboutone half the height of the oven where it is bent over to the oven shelland, with that shell and its flange 5 at the front, and the back wall ofshell 2, constitutes a secondary air chamber into which air is admittedvia a set of holes 33 of predetermined aggregate area, and from whichthe air passes through inclined holes 32.

Above the partition 3| and set on the upper inturned portion of the sameis a flame back 34 of fire-brick or fire-clay which lies against theupper part of the side wall of shell 5 to protect the same from directflame action.

To the left (in Fig. 3) of the secondary air chamber and of thefire-clay flame back 34 is the fuel magazine. This comprises the innerwall 35 of heavy cast iron and extends from the top of the range to aplace below openings 32. The outer wall of the magazine lies adjacentthe side wall of the inner shell and includes a downwardlyinwardlyinclined portion 37 terminating at the grate carrying casting 38, asdoes also wall 35. The front and back walls 48 of the magazinepreferably diverge downwardly or may be vertical if desired from the topof the range (see Fig. 4) and terminate at the grate 39. Opposite theoutlets (holes) 32, the wall 35 has vertically elongated ports 35through which the gases from the ignited fuel bed pass into thegas-burning or combustion chamber, i. e. the space between wall 35 andflame back 34. The outlets 32 are, preferably, staggered with respect tothe ports 36 (see Fig. 4) although if desired they may lie opposite theports (Fig. 3) or some may be staggered and some lie opposite if founddesirable.

46 designates partitions which cut off the flow of air directly to thegas-burning or combustion chamber between the front and back of themagazine. These partitions 46 have holes 48 which communicate with ducts51 that convey overdraft air to small openings 49 in walls 40 near thetop of the magazine (see Figs. 3 and 4).

At the upper part of the magazine are air inlets 5| which are controlledby a damper 52 and constitute what I call the high-speed air control,the purpose of which is to make the fire burn faster when it is firstlighted or when the drafts are opened and the fire in the burner isburning at its very lowest rate after the drafts have been closedseveral hours to cut down or reduce the heat or fire, as in a stand-bywhen the range is not in use.

50 designates air holes through the back Wall of the stove to admit asmall constant supply of secondary air regardless of the dampers. Whenthe burner is burning at a low rate with the highspeed aircontrolclosed, and the main air regulator closed, these secondary airholes supply sufficient air to the air chamber to pass through the airports 32 to give proper combustion at this stage of operation.

The grate 39 has a handle M to which a shaker (not shown) may beattached When door 9 is open and it is desired to shake the grate.

An ash box or pan 42 is supported, between suitable guides 53, on bottomI below grate 33.

Opposite the inclined wall 37 is the air inlet 44 that is controlled bya suitable valve 45 and constitutes the main air supply and controlunit.

To the right (in Fig. 3) of the wall 6 is a chamber, closed at the frontby a door II, which may serve as a compartment for a water heatingreservoir, a warming chamber or be used for any other purpose desired.

The top of the range has removable sections l5, l6 and I1, and removablelids i8 and 29 (Fig. 1). The magazine is filled through a suitablymounted door 19. A clean-out door.l2 is provided between the bottom ofoven door l0 and the skirt 8.

The several doors 9, i3 and II have handles l3 and door I2 has a knob I4(Fig. 1).

The range may have an upward back shield 53 on which may be mounted ashelf with a cooking timer and salt and pepper box assembly 2 I, and acooking top light with shield 22 if desired, and the range may bemounted on suitable legs 23 as shown.

The smoke box 23 has a connection 36 to which the chimney flue may beattached.

Operation The fire is started by putting paper and kindling in thebottom of the magazine above grate 39. After the paper and kindling havebeen placed in the bottom of the magazine, the rest of the magazine isfilled with lump coal.

The fuel door 13 is then closed. This door fits tight so that noappreciable amount of air leaks in around the door and no smoke or fumesescape into the room.

High-speed air regulator 52 and damper 28 are opened. The main airregulator 45 is opened. The fire is lighted from the ash pit by holdinga lighted piece of paper beneath the grate.

The top direct damper 28 is opened when the fire is first lighted,allowing the direct draft of the chimney to draw on the fire. After thefire has been burning about five minutes, the damper 28 is closed,thereby forcing the heat and products of combustion around the oven asindicated by the arrows in Figs. 2 and 3. The hot products of combustiontravel between the top of the oven and the cooking top, down the righthand side of the oven, then under the oven past the flue strip 25, andout the bottom flue opening 25 where the burned gases, etc., aredischarged into the back smoke box 29 to which the smoke pipe (notshown) is connected.

The air regulator 45 controls the amount of air, primary, which goesthrough the grate 39, overdraft which goes through the holes 49, and secondary air, which goes through holes 33, through the secondary airchamber, and out through the holes 32 into the gas-burning or combustionchamber near the base of the flames, and between the flames burningthrough the port holes 36. The air regulator 45 controls such operationwhen the high-speed air regulator is closed.

A portion of the air admitted by the regulator 45 is drawn through theholes 48, ducts 4'! and holes 49 into the magazine on top of the coaltherein. This air (secondary air) is arranged so that just enough isdrawn in to cause enough down-draft through the fuel to carry the gasesand other distillates from the coal above the combustion zone, downthrough the fuel and discharge the same through the port holes 36 andburn clean. The coal in the magazine is coked as it feeds down to theburning zone near the grate 39 and port holes 36.

The magazine holds sufiicient coal to last all day and by replenishingthe fuel, closing the air regulator, the fire may be started the nextmorning and quickly heat up the range by simply stirring up the coke andcoal in the magazine, adding a small amount of coal and opening thedrafts. By admitting all the air for combustion through the regulator45, it is very easy to control the fire and the heat for the oven,something that is very difiicult to accomplish satisfactorily with theranges of the prior art.

The high-speed air damper 52 is opened when one wishes to have the firecome back quickly after it has been banked or standing by; this damperis not open after the range has become heated, as this extra amount ofair, or the extra amount of down-draft, is not required except duringthe starting or recovery period because the lower air regulator 45supplies sufficient primary air for the grate and for the over-draft airpassing through the holes 49, and at the same time sufiicient secondaryair, in addition to the fixed secondary air openings 50 in the back ofthe range, to provide enough air for a satisfactory burning rate for therange, and to prevent clogging in the magazine, and to carry theproducts of distillation of the fuel bed through the incandescent fuelin the bottom of the magazine and out through the ports where they areproperly burned. By carrying the products of distillation from the coalwhich is being coked above the bed of incandescent coke, through theincandescent fuel bed, either in a downward or sidewise direction, thesegases are raised to ignition temperature, so that when they have passedthrough the constricted area port holes 36 they are burned promptly inthe presence of a sufficient supply of secondar air.

By diverging the walls 46 downwardly, the bridging action of the fuel isreduced to a minimum allowing a downward movement of the coal as it isconsumed.

By a proper designing and proportioning of the areas and positions ofthe holes 32, 33, ports 36 and holes 49, with regard to the fuel used(hard or soft coal), it is possible to use a single air regulator 45 andyet maintain high efficiency of operation. operating skill to a minimumand make the range practically fool-proof.

By carrying the products of combustion, gases, etc., throughconstricted-area port holes, the burning rate of the fire may be morequickly regulated and may be definitely controlled, whereas in amagazine feed that does not constrict the outlet through open portholes, or where the magazine has an open slot or partition or side wallout from under which the flame burnsas in the stoves of theaforementioned patentsit is very difficult to regulate or control theburning rate and to get clean burning.

From the foregoing description, taken with the accompanying drawings, itis thought the construction, operation and advantages of my improvedrange will be clear to those skilled in the art.

What I claim is:

1. In a range, an enclosing body having a top The two air regulatorsreduce and a bottom, an oven shell in said body, said body having aspace to one side of said oven shell, which space contains a fuelmagazine and a separate gas-burning chamber alongside said magazine,said magazine comprising side walls, front and back walls, and a grateat the bottom, the side wall of said magazine which faces the oven beingspaced therefrom and having gas ports above but adjacent the grate, asecondary air duct in said space betweeen said wall with the gas portsand the oven and having air discharge holes adjacent said ports foradmitting secondary air into the gas-burning chamber with the gases fromsaid ports to complete the combustion of said gases, said magazinehaving at least one over-draft air hole near its top for admission ofair above the coal in the magazine, partitions separating saidgas-burning chamber from the space below the grate, a duct for conveyingoverdraft air to said at least one over-draft air hole, and an airregulator for regulating the air passing through said grate, saidsecondary air ducts and said over-draft air hole, said range having aflue outlet for passing the products of combusiton to a chimney fiue andmeans to divert the products of combustion about the oven before passingto the fiue outlet.

2. In a range of the character described, an outer casing enclosing anoven shell, and a coal magazine at one side of the oven shell andenclosing a gas-burning chamber located alongside the magazine and anash chamber, a front door for the combustion and ash chambers, a frontdoor for the oven, a duct for carrying the products of combustion overthe top, down one side and under the oven shell to a fine outlet in saidouter casing, said magazine comprising two side walls, a front wall anda back wall and a bottom grate, the side wall of the magazine facing theoven shell being spaced from the same to provide a gas-burning spacealongside the magazine and being provided with flame ports adjacent thegrate, a secondary air duct adjacent the oven and having air dischargeholes directed upwardly toward said ports, an insulation fiame backabove said holes and held beside the oven shell, said secondary air ducthaving airadmitting holes communicating with the space below the grate,said magazine having a tight top door and having at least one over-draftairadmitting hole in one wall above the coal level, and an air duct forconveying air from the space below the grate to said over-draft airhole, and an air regulator for admitting air into the space below thegrate for supplying air to the fire through the grate and for supplyingair to said secondary air duct and to said over-draft air hole, andmeans to discharge the products of combustion from the range.

3. A coal-burning range which includes an outer casing, a top castingand a bottom, an oven shell in said casing and spaced from one side wallthereof, a vertical cross partition at the other side of the oven shelland spaced from the same to provide a down-flow flue, said oven shellbeing spaced from the top casting to provide a top cross flue from oneside of the oven to the other, said shell being spaced from the bottomto provide a bottom flue beneath the shell, there being an outlet fromthe bottom flue for products of combustion, a coal magazine located inthe space between the oven shell and the first mentioned side wall ofthe casing, said magazine comprising front, back and side walls, abottom grate and a tight top door, the side wall of the magazine whichfaces the oven being spaced from the same and including a lower portionin clined downwardly toward the oven, a secondary air duct locatedbetween the oven and said inclined lower portion, said inclined lowerportion having flame passing ports and said secondary air duct havingair holes adjacent said ports for directing the secondary air upwardlyand toward said ports, said ports and secondary air duct holes beingstaggered, a flame back located against the oven and above saidsecondary air duct, said magazine having an over-draft air hole in itswall at about the coal top-level, partitions to separate the spacearound the magazine into an upper part and a lower part, the lower partbeing in communication with the grate and the inlet only of saidsecondary air duct, another air duct to effect communication betweensaid lower part and said over-draft air hole at the top of the magazine,and air regulating and admitting means for said lower part.

4. A coal-burning range which includes an outer casing, a top castingand a bottom, an oven shell in said casing spaced from one side wallthereof, a vertical cross partition at the other side of the oven shelland spaced from the same to provide a downflow flue, said oven shellbeing spaced from the top casting to prove a top, cross flue from oneside of the oven to the other, said shell being spaced from said bottomto provide a bottom flue beneath the shell, there being an outlet fromthe bottom flue for products of combustion, a coal magazine located inthe space between the oven shell and the first mentioned side wall ofthe casing, said magazine comprising front, back and side walls, abottom grate and a tight top door, the side wall of the magazine whichfaces the oven being spaced from the same and including a lower portioninclined downwardly toward the oven, a secondary air duct locatedbetween the oven and said inclined lower portion, said inclined lowerportion having flame passing ports and said secondary air duct havingair holes adjacent said ports for directing the secondary air upwardlyand toward said ports, a flame back located against the oven and abovesaid secondary air duct, said magazine having an over-draft air hole inits wall at about the coal top-level, partitions to separate the spacearound the magazine into an upper part and a lower part, the lower partbeing in communication with the grate and the inlet only of saidsecondary air duct, another air duct to eflect communication betweensaid lower part and said over-draft air hole at the top of the magazine,and air regulating and admitting means for said lower part.

5. A coal-burning range which includes an outer casing, a top castingand a bottom, an oven shell in said casing spaced from one side wallthereof, a vertical cross partition at the other side of the oven shelland spaced from the same to provide a down-flow flue, said oven shellbeing spaced from the top casting to provide a top cross flue from oneside of the oven to the other, said shell being spaced from said bottomto provide a bottom flue beneath the shell, there being an outlet fromthe bottom flue for products of combustion, a coal magazine located inthe space between the oven shell and the first mentioned side wall ofthe casing, said magazine comprising front, back and side walls, abottom grate and a tight top door, the side wall of the magazine whichfaces the oven being spaced from the same and including a lower portioninclined downwardly toward the oven, a secondary air duct locatedbetween the oven and said inclined lower portion, said inclined lowerportion having flame passing ports and said secondary air .duct havingair holes adjacent said ports for directing the secondary air upwardlyand toward said ports, a flame back located against the oven and abovesaid secondary air duct, said magazine having an over-draft air hole inits wall at about the coal top-level, partitions to separate the spacearound the magazine into an upper part and a lower part, the lower partbeing in communication with the grate and the inlet only of saidsecondary air duct, another air duct to effect communication betweensaid lower part and said over-draft air hole at the top of the magazine,air regulating and admitting means for said lower part, and a high-speeddamper-controlled over-draft air admitting means to the upper part ofthe magazine.

6. In a range having an oven shell over which heat and products ofcombustion pass to a flue, means for generating heat by combustion ofcoal and coal gas, said means comprising a chamber in the range, a .fuelmagazine in said chamber, said magazine having a top fuel door andbottom grate, the cross-sectional area of the magazine increasing fromthe top door toward the grate, said magazine including a heavy wall onthe oven side which wall adjacent the grate has gas and flame ports, asecondary air box located between said heavy wall and the oven at thelower end of said heavy wall, said air box having air inlets, and havingair outlet holes directed upwardly and toward said flame ports forfeeding secondary air to the flames, a flame back above said air boxprotecting the oven against direct flame action, partitions between themagazine and the front and back of the range to divide said chamber intoa lower part and an upper part, the lower part being in directcommunication with the grate and the inlets of the air box, saidmagazine having an over-draft air hole near its top, a duct from thelower part of said chamber to said over-draft air hole, and means toadmit air into said lower part and regulate the same.

'7. In a range having an oven shell over which heat and products ofcombustion pass to a flue, means for generating heat by combustionofcoal and coal gas, said means comprising a chamber in the range, afuel magazine in said chamber, said magazine having a top fuel door anda bottom grate, the cross-sectional area of the magazine increasing fromthe top door toward the grate, said magazine including a heavy wall onthe oven side which will adjacent the grate has gas and flame ports, asecondary air box located between said heavy wall and the oven at thelower end of said heavy wall, said air box having air inlets, and havingair outlet holes directed upwardly and toward said flame ports forfeeding secondary air to the flames, a flame back above said air box andprotecting the oven against direct flame action, partitions between themagazine and the front and back of the range to divide said chamber intoa lower part and an upper part, the lower part being in directcommunication with the grate and the inlets of the air box, saidmagazine having an over-draft air hole near its top, a duct from thelower part of said chamber to said over-draft air hole, and means toadmit air into said lower part and regulate the same, and a controlledhigh-speed air admitting means to the upper part of the magazine.

8. In a range having an oven shell over which heat and products ofcombustion pass to a flue, means for generating heat by combustion ofcoal and coal gas, said means comprising a chamber in the range, a fuelmagazine in said chamber, said magazine having a top fuel door and abottom grate, the cross-sectional area of the magazine increasing fromthe top door toward the grate, said magazine including a heavy wall onthe oven side which wall adjacent the grate has gas and flame ports, asecondary air box located between said heavy wall and the oven at thelower end of said heavy wall, said air box having air inlets, and havingair outlet holes directed upwardly and toward said flame ports forfeeding secondary air to the flames, a flame back above said air boxprotecting the oven against direct flame action, partitions between themagazine and the front and back of the range to divide said chamber intoa lower part and an upper part, the lower part being in directcommunication with the grate and the inlets of the air box, saidmagazine having an over-draft air hole near its top, a .duct from thelower part of said chamber to said over-draft air hole, and means toadmit air into said lower part and regulate the same, some of said airbox inlets communicating directly with the atmosphere and the otherscommunicating with the lower part of said chamber.

9. In a range having an oven shell over which heat and products ofcombustion pass to a flue, means for generating heat by combustion ofcoal and coal gas, said means comprising a chamber in the range, a fuelmagazine in said chamber, said magazine having a top fuel door and abottom grate, the cross-sectional area of the magazine increasing fromthe top door toward the grate, said magazine including a heavy wall onthe oven side which wall adjacent the grate has gas and flame ports, asecondary air box located between said heavy wall and the oven at thelower end of said heavy wall, said air box having air inlets, and havingair outlet holes directed upwardly and toward said flame ports forfeeding secondary air to the flames, a flame back above said air box andprotecting the oven against direct flame action, partitions between themagazine and the front and back of the range to divide said chamber intoa lower part and an upper part, the lower part being in directcommunication with the grate and the inlets of the air box, saidmagazine having an over-draft air hole near its top, a duct from thelower part of said chamber to said over-draft air hole, and means toadmit air into said lower part and regulate the same, and a controlledhigh-speed air admitting means to the upper part of the magazine, someof said air box inlets communicating directly with the atmosphere andthe others communicating with the lower part of said chamber.

10. In a cooking and baking range having a burner chamber, partitionsdividing said burner chamber into a top part and a bottom part, a coalburner in said chamber and comprising a magazine having side and endwalls and a bottom grate, one of said side walls having gas portsadjacent the grate end of the magazine, said grate lying at an acuteangle to the ported side wall, a secondary air chamber in said burnerchamber spaced from said ported wall and having air outlets directedtoward said ports and having air inlets communicating with the bottompart of saidburner chamber, a main air control means to admit air to thebottom part of said burner chamber, and at least one over-draft air ductfor effecting communication between the lower part of said burnerchamber and the upper part of said magazine,

11. In a cooking and baking range having a burner chamber, partitionsdividing said burner chamber into a top part and a bottom part, a coalburner in said chamber and comprising a magazine having side and endwalls and a bottom grate, one of said side walls having gas portsadjacent the grate end of the magazine, said grate lying at an acuteangle to the ported side wall, a secondary air chamber in said burnerchamber spaced from said ported wall and having air outlets directedtoward said ports and having air inlets communicating with the bottompart of said burner chamber, a main air control means to admit air tothe bottom part of said burner chamber, and at least one over-draft airduct for effecting communication between the lower part of said burnerchamber and the upper part of said magazine, said secondary air chamberhaving means to admit a predetermined constant supply of air direct fromatmosphere.

12. In a cooking and baking range having a burner chamber, partitionsdividing said burner chamber into a top part and a bottom part, a coalburner in said chamber and comprising a magazine having side and endwalls and a bottom grate, one of said side walls having gas portsadjacent the grate end of the magazine, said grate lying at an acuteangle to the ported side wall, a secondary air chamber in said burnerchamber spaced from said ported wall and having air outlets directedtoward said ports and having air inlets communicating with the bottompart of said burner chamber, a main air control means to admit air tothe bottom part of said burner chamber, at least one over-draft air ductfor effecting communication between the lower part of said burnerchamber and the upper part of said magazine, and a high-speed over-draftair admitting and controlling means to the upper part of said magazine.

13. In a cooking and baking range having a burner chamber, partitionsdividing said burner chamber into a top part and a bottom part, a coalburner in said chamber and comprising a magazine having side and endwalls and a bottom grate, one of said side walls having gas portsadjacent the grate end of the magazine, said grate lying at an acuteangle to the ported side wall, a secondary air chamber in said burnerchamber spaced from said ported wall and having air outlets directedtoward said ports and having air inlets communicating with the bottompart of said burner chamber, a main air control means to admit air tothe bottom part of said burner chamber, at least one over-draft air ductfor effecting communication between the lower part of said burnerchamber and the upper part of said magazine, and a high-speed over-draftair admitting and controlling means to the upper part of said magazine,said secondary air chamber having means to admit a predeterminedconstant supply of air direct from atmosphere.

NEIL H. CARGILE.

